Daily Practice

GCSE Science

27th December 1983

5 questions · GCSE · 584 questions in this band

1
Atomic Structure
A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
2
Atomic Structure and the Development of the Model
Why is the atomic model a good example of how scientific models change?
3
Radioactivity, Half-Life and Nuclear Uses
Explain the difference between irradiation and contamination.
4
Forces
A resultant force of 45 N acts on an object of mass 9.0 kg. Calculate its acceleration. Use F = m x a.
5
Motion: Speed, Velocity and Acceleration
A runner completes a 400 m race in 52 s. Calculate her average speed, giving your answer to 3 significant figures.

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